For what it's worth, I just sold a 2008 X5. I had it advertised here, on Craigslist, on Autotrader and BMWCCA. It was for sale for about 6 weeks. The only responses were from Craigslist. Same ad, same pics, same details, same price. Perhaps cars.com is better, but I was pretty disappointed with autotrader (had used several years ago successfully).

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Mike

2005 e53 X5 4.8is 169k miles
2018 f90 M5
2018 Volvo XC60